Ivan Vitev 

Large Angle Hadron Correlations 
from Medium-Induced Gluon Radiation

Abstract: 

Final state medium-induced  gluon radiation in ultra dense 
nuclear matter is examined and shown to favor large angle emission 
when compared to vacuum bremsstrahlung. Perturbative expression 
for the contribution of its hadronic fragments to the back-to-back 
particle correlations is derived. It is found that in the limit 
of large jet energy loss  gluon radiation  determines the 
yield and angular distribution of Delta phi > pi/2 di-hadrons to
transverse momenta as large as pT ~ 10 GeV. Clear transition from
enhancement to suppression of the away-side particle correlations 
is established at pT ~ 2 GeV. I will also discuss the possible
shortcomings in the PHENIX experimental extraction of the correlation
shape as evidenced by independent STAR analysis.